ALSA: aoa: Remove obsolete cleanup for clientdata

The i2c core will clear the clientdata pointer automatically.
We don't have to set the `data' field to NULL in remove() or
if probe() failed anymore.

Also remove a unneeded NULL checking for kfree.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/aoa/codecs/onyx.c b/sound/aoa/codecs/onyx.c
index 3687a6c..762af68 100644
--- a/sound/aoa/codecs/onyx.c
+++ b/sound/aoa/codecs/onyx.c
@@ -1067,7 +1067,6 @@
 	printk(KERN_DEBUG PFX "created and attached onyx instance\n");
 	return 0;
  fail:
-	i2c_set_clientdata(client, NULL);
 	kfree(onyx);
 	return -ENODEV;
 }
@@ -1112,8 +1111,7 @@
 
 	aoa_codec_unregister(&onyx->codec);
 	of_node_put(onyx->codec.node);
-	if (onyx->codec_info)
-		kfree(onyx->codec_info);
+	kfree(onyx->codec_info);
 	kfree(onyx);
 	return 0;
 }